from dataclasses import dataclass, field
from typing import  Optional

from dataclasses_json import dataclass_json, config
import json

import models.target

@dataclass_json
@dataclass
class Rectangle:
    x: int
    y: int
    width: int
    height: int
    p: Optional[models.target.Point]= field(default=None, metadata=config(exclude=lambda x: x is None))

# 使用
p=models.target.Point(1,2)
rect = Rectangle(0, 0, 100, 100,None)
# 序列化
json_str=rect.to_json()
# json_str = json.dumps(rect, default=lambda obj: obj.__dict__)
print(f"序列化后={json_str}")

rect.p.x=2046
print("修改后p.x=",p.x)

new_json='{"x": 1, "y": 1, "width": 100, "height": 100, "p": {"x": 2, "y": 2}}'
nr=Rectangle.from_json(new_json)
print(nr.p)